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Types of filters

<<Types of filters

Sanitize filters>>

Validate filters

Listing of filters for validation
ID Name Options Flags Description
FILTER_VALIDATE_BOOLEAN "boolean"   FILTER_NULL_ON_FAILURE

Returns TRUE for "1", "true", "on" and "yes". Returns FALSE otherwise.

If FILTER_NULL_ON_FAILURE is set, FALSE is returned only for "0", "false", "off", "no", and "", and NULL is returned for all non-boolean values.

FILTER_VALIDATE_EMAIL "validate_email"     Validates value as e-mail.
FILTER_VALIDATE_FLOAT "float" decimal FILTER_FLAG_ALLOW_THOUSAND Validates value as float.
FILTER_VALIDATE_INT "int" min_range, max_range FILTER_FLAG_ALLOW_OCTAL, FILTER_FLAG_ALLOW_HEX Validates value as integer, optionally from the specified range.
FILTER_VALIDATE_IP "validate_ip"   FILTER_FLAG_IPV4, FILTER_FLAG_IPV6, FILTER_FLAG_NO_PRIV_RANGE, FILTER_FLAG_NO_RES_RANGE Validates value as IP address, optionally only IPv4 or IPv6 or not from private or reserved ranges.
FILTER_VALIDATE_REGEXP "validate_regexp" regexp   Validates value against regexp, a Perl-compatible regular expression.
FILTER_VALIDATE_URL "validate_url"   FILTER_FLAG_PATH_REQUIRED, FILTER_FLAG_QUERY_REQUIRED Validates value as URL (according to » http://www.faqs.org/rfcs/rfc2396), optionally with required components. Note that the function will only find ASCII URLs to be valid; internationalized domain names (containing non-ASCII characters) will fail.

Hinweis:

Numbers +0 and -0 are not valid integers but validate as floats.


3 BenutzerBeiträge:
- Beiträge aktualisieren...
Clifton
5.01.2011 17:00
FILTER_VALIDATE_EMAIL does NOT allow incomplete e-mail addresses to be validated as mentioned by Tomas.

Using the following code:

<?php
$email
= "clifton@example"; //Note the .com missing
echo "PHP Version: ".phpversion().'<br>';
if(
filter_var($email, FILTER_VALIDATE_EMAIL)){
    echo
$email.'<br>';
   
var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));
}else{
   
var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));   
}
?>

Returns:
PHP Version: 5.2.14 //On MY server, may be different depending on which version you have installed.
bool(false)

While the following code:

<?php
$email
= "clifton@example.com"; //Note the .com added
echo "PHP Version: ".phpversion().'<br>';
if(
filter_var($email, FILTER_VALIDATE_EMAIL)){
    echo
$email.'<br>';
   
var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));
}else{
   
var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));   
}
?>

Returns:
PHP Version: 5.2.14 //On MY server, may be different depending on which version you have installed.
clifton@example.com
string(16) "clifton@example.com"

This feature is only available for PHP Versions (PHP 5 >= 5.2.0) according to documentation. So make sure your version is correct.

Cheers,
Clifton
tomas dot chlouba at gmail dot com
18.12.2010 17:42
FILTER_VALIDATE_EMAIL allows incomplete e-mail addresses to be validated, for examle john@gmail will validate as a proper e-mail address.
pravila at alumni dot calpoly dot edu
21.03.2010 17:53
Take caution when using the FILTER_VALIDATE_BOOLEAN filter as it seems to have different behaviors when used in the filter_var() vs. the filter_input() functions.

To demonstrate, let's parse some arguments from a GET request (notice how arg2 is NOT set):

example.com/script.php?arg1=yes&arg3=no

<?php
// filtering by variable
$var1 = filter_var($_GET["arg1"], FILTER_VALIDATE_BOOLEAN);
$var2 = filter_var($_GET["arg2"], FILTER_VALIDATE_BOOLEAN);
$var3 = filter_var($_GET["arg3"], FILTER_VALIDATE_BOOLEAN);

// filtering by input
$input1 = filter_input(INPUT_GET, "arg1", FILTER_VALIDATE_BOOLEAN);
$input2 = filter_input(INPUT_GET, "arg2", FILTER_VALIDATE_BOOLEAN);
$input3 = filter_input(INPUT_GET, "arg3", FILTER_VALIDATE_BOOLEAN);

// as expected...
var_dump($var1);      // bool(true)
var_dump($var2);      // bool(false)
var_dump($var3);      // bool(false)

// NULL is not an expected return...
var_dump($input1);    // bool(true)
var_dump($input2);    // NULL
var_dump($input3);    // bool(false)
?>

As per the documentation, the return is limited to true XOR false unless the FILTER_NULL_ON_FAILURE flag is set, but it seems as if this flag is set automatically with the filter_input() function.

(Note: same behavior for filter_var_array() vs. filter_input_array())



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